This consolidated version of IEC 60061-2 is based on the third edition (1969) and its supplements A(1970), B(1971), C(1972), D(1975), E(1975), F(1980), G(1983), H(1987), J(1989), K(1992), L(1994), M(1994), N(1995), P(1996), Q(1996), R(1996), S(1997), and